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Les Diaboliques, released as Diabolique in the United States and variously translated as The Devils or The Fiends is a 1955 French psychological horror thriller film co-written and directed by Henri-Georges Clouzot, starring Simone Signoret, Véra Clouzot, Paul Meurisse and Charles Vanel. It is based on the 1952 novel She Who Was No More by Pierre Boileau and Thomas Narcejac.

The story blends elements of Suspense, thriller and horror, with the plot focusing on a woman and her husband's mistress who conspire to murder the man. Christina Delassalle suffers greatly at the hands of her brutish husband Michel. She inherited the boys' boarding school they run but it's clearly Michel who is in charge. She and Nicole Horner, one of the teachers and Michel's former lover, decide to kill him. Christina, who has a serious condition, is terrified when, by chance, she meets a retired police inspector who decides to look into the case.

Cast:

Simone Signoret as Nicole Horner

Véra Clouzot as Christina Delassalle

Paul Meurisse as Michel Delassalle

Charles Vanel as Alfred Fichet

Jean Brochard as Plantiveau

Thérèse Dorny as Mme Herboux

Michel Serrault as M. Raymond

Georges Chamarat as Dr. Loisy

Robert Dalban as the gas station attendant

Camille Guérini as the photographer

Jacques Hilling as the employee of the forensic institute

Jean Lefebvre as the soldier

Aminda Montserrat as Mme Plantiveau

Jean Témerson as the hotel waiter

Jacques Varennes as M. Bridoux

Georges Poujouly as Soudieu

Noël Roquevert as M. Herboux

Pierre Larquey as M. Drain

Johnny Hallyday as a student (uncredited)

Madeleine Suffel as the degreaser (uncredited)